package com.coolweather.app.model;

import java.util.ArrayList;
import java.util.List;

import com.coolweather.app.db.CoolWeatherOpenHelper;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

public class CoolWeatherDB {

	/**
	 * 数据库名
	 */
	public static final String DB_NAME = "cool_weather";
	
	/**
	 * 数据库版本
	 */
	public static final int VERSION = 1;
	private static CoolWeatherDB coolWeatherDB ;
	private SQLiteDatabase db;
	
	/**
	 * 将构造方法私有化
	 */
	private CoolWeatherDB(Context context) {
		CoolWeatherOpenHelper dbHelper = new CoolWeatherOpenHelper(context, DB_NAME, null, VERSION);
		Log.d("test", "CoolWeatherDB constructor");
		db = dbHelper.getWritableDatabase();
	}
	
	/**
	 * 获取CoolWeatherDB的实例
	 */
	public synchronized static CoolWeatherDB getInstance(Context context){
		if (coolWeatherDB == null){
			coolWeatherDB = new CoolWeatherDB(context);
			Log.d("test", "CoolWeatherDB getInstance");
		}
		return coolWeatherDB;
	}
	
	/**
	 * 将province实例存储到数据库。
	 */
	public void saveProvince(Province province){
		if (province != null){
			Log.d("test", "CoolWeatherDB saveProvince");
			ContentValues values = new ContentValues();
			values.put("province_name", province.getProvinceName());
			values.put("province_code", province.getProvinceCode());
			db.insert("Province", null, values);
		}
	}
	
	/**
	 * 从数据库中读取全国所有的省份信息
	 */
	public List<Province>loadProvinces(){
		List<Province> list = new ArrayList<Province>();
		Cursor cursor = db.query("Province", null, null, null, null, null, null);
		Log.d("test", "CoolWeatherDB loadProvinces() cursor value is -->"+cursor);
		if (cursor.moveToFirst()){
			Log.d("test", "CoolWeatherDB loadProvinces() cursor value is -->"+cursor);
			do {
				Province province = new Province();
				province.setId(cursor.getInt(cursor.getColumnIndex("id")));
				Log.d("test", "CoolWeatherDB province id-->"+province);
				province.setProvinceName(cursor.getString(cursor.getColumnIndex("province_name")));
				province.setProvinceCode(cursor.getString(cursor.getColumnIndex("province_code")));
				list.add(province);
				Log.d("test", "CoolWeatherDB loadProvinces() province value is -->"+province);
			}while(cursor.moveToNext());
		}
		if (cursor != null){
			cursor.close();
		}
		return list;
	}
	
	/**
	 * 将City实例存储到数据库。
	 */
	public void saveCity(City city){
		if (city != null){
			ContentValues values = new ContentValues();
			values.put("city_name", city.getCityName());
			values.put("city_code", city.getCityCode());
			values.put("province_id", city.getProvinceId());
			db.insert("City", null, values);
		}
	}
	
	/**
	 * 从数据库读取某省下所有的城市信息。
	 */
	public List<City> loadCities(int provinceId){
		
		List<City> list = new ArrayList<City>();
		Cursor cursor = db.query("City", null, "province_id = ?", new String[]{String.valueOf(provinceId)}, null, null, null);
		Log.d("test", "CoolWeatherDB cursor(db)-->"+cursor);
		if (cursor.moveToFirst()){
			do{
				City city = new City();
				city.setId(cursor.getInt(cursor.getColumnIndex("id")));
				city.setCityName(cursor.getString(cursor.getColumnIndex("city_name")));
				city.setCityCode(cursor.getString(cursor.getColumnIndex("city_code")));
				city.setProvinceId(provinceId);
				list.add(city);
			} while (cursor.moveToNext());
		}
		if (cursor != null){
			cursor.close();
		}
		return list;
	}
	
	/**
	 * 将county实例存储到数据库
	 */
	public void saveCounty(County county){
		if (county != null){
			ContentValues values = new ContentValues();
			values.put("county_name", county.getCountyName());
			values.put("county_code", county.getCountyCode());
			values.put("city_id", county.getCityId());
			db.insert("County", null, values);
		}
	}
	
	/**
	 * 从数据库读取某城市下所有的县信息。
	 */
	public List<County> loadCounties(int cityId){
		List<County> list = new ArrayList<County>();
		Cursor cursor = db.query("County", null, "city_id = ?", new String[]{String.valueOf(cityId)}, null, null, null);
		if (cursor.moveToFirst()){
			do{
				County county = new County();
				county.setId(cursor.getInt(cursor.getColumnIndex("id")));
				county.setCountyName(cursor.getString(cursor.getColumnIndex("county_name")));
				county.setCountyCode(cursor.getString(cursor.getColumnIndex("county_code")));
				county.setCityId(cityId);
				list.add(county);
			}while(cursor.moveToNext());
		}
		if (cursor != null){
			cursor.close();
		}
		return list;
		
	}
}
